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Supplemental Financial Information (Tables)
 3 Months Ended
Mar. 31, 2022
Supplemental Income Statement Elements [Abstract]  
Schedule of Restructuring and Impairment Charges The components of “Restructuring and impairment charges” line item in the condensed consolidated statements of operations, which contains restructuring charges and related expenses, as well as impairment charges, were as follows:
Three Months Ended
(Dollars in thousands)March 31, 2022March 31, 2021
Restructuring charges
Manufacturing footprint optimization$69 $1,506 
Total restructuring charges69 1,506 
Total restructuring and impairment charges$69 $1,506 
Schedule of Severance Activity Severance and related benefits activity related to the manufacturing footprint optimization plan is presented in the table below for the three months ended March 31, 2022:
(Dollars in thousands)Manufacturing Footprint Optimization Restructuring Severance
Balance as of December 31, 2021$1,395 
Provisions— 
Payments(26)
Foreign currency translation adjustment(26)
Balance as of March 31, 2022$1,343 
Schedule of Other Operating (Income) Expense The components of “Other operating (income) expense, net” line item in the condensed consolidated statements of operations, were as follows:
Three Months Ended
(Dollars in thousands)March 31, 2022March 31, 2021
UTIS fire
Fixed assets write-offs$— $891 
Inventory charges201 280 
Professional services434 522 
Lease obligations232 486 
Compensation & benefits796 244 
Other11 — 
Insurance recoveries(2,190)(1,119)
Total UTIS fire(516)1,304 
(Gain) loss on sale or disposal of property, plant and equipment(15)(89)
Total other operating (income) expense, net$(531)$1,215 
Schedule of Components of Interest Expense, Net
The components of “Interest expense, net” line item in the condensed consolidated statements of operations, were as follows:
Three Months Ended
(Dollars in thousands)March 31, 2022March 31, 2021
Interest on revolving credit facility$839 $101 
Line of credit fees138 273 
Debt issuance amortization costs179 179 
Interest income(108)(195)
Other21 249 
Total interest expense, net$1,069 $607